Dishwasher



June F. J/R. KARLSTROM DISH WASHER Filed Apr il 11, 1940 6 Sheets-Sheet 1 MORNEY.

June 13, 1944. FJ. RLKARLsTRQM DISH WASHER Filed April 11, 1940 6 Sheets-Sheet 2 W 4 W BY 2% J1me FQJ. R. KARLSTRC M ,3 4

6 DISH WASHER Fil ed April 11, 194C 6. Sheets-Sheet 3 ""IIIII M BY 4; ATTORNEY.

Jm Q

June 194.4. F. J. R. KARLSTRGM v ,351,342

DISH WASHER J1me .1944; F. J. R. KARLSTROM 2,351,342

msa WASHER -F-i led April 11, 1940 6 Sheets-Sheet 5 MW m WAAAQAQAAAAAAAAAAAA June 1944- F. J. R. KARLSTROM DISH WASHER Filed April 11, 1940 6 Sheets-Sheet 6 X, 43 ATTORNEY Patented June 13, 1944 DISHWASMB Fredrik Johan Robert Karlstriim, Bo, Sweden,

assignor to Aktiebolaget Elektrolmx, Stockholm, Sweden, a corporation 01' Sweden Application April 11, 1940, Serial No. 329,092

in SwedenApzil 12, 1939 13 Claims.

My invention relates to 'dishwashing apparatus. One of the objects oi my invention is to provide an apparatus of this type wherein the sprays are caused to move with respect to the dishes in order to improve the washing and rinsing. Another object of my invention is to provide a water pump for the dual purpose of recirculating water through the sprays and causing the aforesaid movement of the sprays.-

' .cordance with my invention rotary movement produced by the pump is translated into straight line, or a combination of straight line and circular movement of the sprays.

Another object of my invention is to provide a single control member for controlling the operation of the motor driving the pump and for controlling the admission and discharge of liquid to the apparatus. In addition, the control member automatically locks and unlocks the cover of the dishwasher sothat the latter may be opened only when the apparatus is not operating.

A still further object of my invention is to provide means for automatically lifting the dishsupporting rack when the cover is opened. Preferably this is accomplished hydraulically.

Anotherobject of my invention is to provide the interior of the apparatus with surfaces s formed as to deflect liquid impinging, thereon from the sprays against the dishes in orderto utilize liquid which would otherwise miss the dishes.

Another object of my invention is to provide means for introducing hot air into' the apparatus for the purpose of drying the dishes.

tion will be apparent from the following description considered in connection with the accompanying drawings, which form, apart of this specification, and of which:

Fig. 1 is a cross-sectional view of one embodiment of my invention; Fig. 2 is a cross-sectional view taken on the line 2-2 of Fig. 1; Fig. 3 is a cross-sectional view of another embodiment of my invention and is taken on the line 3-3 of Fig. 4;

Fig. 4 is a cross-sectional view taken on the line 4-4 of Fig. 3;

Fig. 5 is a cross-sectional view of the apparatus shown in Figs. 3 and 4;

Figs. 6 through 11 are cross-sectional views showing difierent positions of a valve 82 shown in Fig. 5; r

Fig. 12 is a cross-sectional view taken on the lines l2-l2 ofFigs. 5 and 13; V

Fig. 13 is a cross-sectional view taken on the line l3-l3of Fig. 12;

Fig. 14 is a view of a portion of the inside of the cover of the apparatus shown in Fig. 5;

Fig. 15 is a cross-sectional view taken on the line 15-15 of Fig. 14;

Fig. 16 is a cross-sectional view of a portion of an apparatus similar to that shown in Fig. 3,

but showing a modification;

Fig. 17 is a cross-sectional view of a further embodiment of my invention;

Fig. 18 is a cross-sectimal view taken on the line i8l8 of Fig. 17;

Fig. 19 is a part of Fig. 17 on a larger scale; and V Fig. "20- is a cross-sectional view taken on the line 20-20 of Fig. 17. v

Referring more particularly to Figs. 1 and 2, reference character I 0 designates a tank or receptacle which is suspended in an outer casing H (see Figs. 1 and 5). A hollow casting I2 is secured in water-tight relation to the lower part of receptacle It. The receptacle Ill and casting l2 form a casing for the mechanism ofthe device. Rotatably moimted within casting I 2 by means .ofbearings 13a and HI) is a pump housing It.

Casting I2 is formed with an annular recess IS with which communicates a water supply pipe i5 and a drain pipe l6. Pump housing 13 is formed with an aperture I? in alignment with the recess l4 and a passage 18 leads from opening I! to the central part of the pmnp chamber l9.

An impeller 20 is mounted on a vertical shaft 2| which is rotatably mounted in the pump hous- Further objects and advantages of my inven 35 ing l3. The impeller is formed with openings 33 adjacent to its hub.

casting I2 and is provided with a belt pulley 22 arranged to be driven by an electric motor 23 through a belt 24. Suitable bearings are provided between the casting l2, pump-housing l3 and shaft 2|, as well as suitable packings for preventing leakage through the lower end of casting 12.

Impeller shaft 2! is hollow and a valve stem- 25 extends therethrough. A valve 28 is secured totheupperendofthisstemandisarranged The lower endof shaft 2| extends below the pump housing andbelow the pivoting in a clockwise direction of the lever serves to open the valve 26 against the force of spring 29. Lever 30 may be operated directly by the foot or may be'provided with a rod 32 extending to the top of the apparatus.

Preferably, the pump housing I3 is provided with vanes 34 arranged around the periphery of the impeller. Extending upwardly from the pump housing near its periphery is a hollow member 35 which constitutes the outlet of the pump. Rotatably mounted on member 35 is a tubular arm 36. The member 35 is formed with a plurality of openings 31 in alignment with the interior of tubular arm 36. Rotatably mounted in the opposite end of tubular arm 36 is a hollow T 38 which is formed with a plurality of openings 39 in alignment with the interior of arm 36. The

- branches of the T are connected to a rectangular sprayer 40. The sprayer comprises lower horiopposite side of member35 and is provided with a roller 46 at its free end. A flxed straight rail. 41 extends across the central part of receptacle ID. A plurality of rollers 48 are rotatably mounted on T 38 so as to: engage both sides of rail 41.

A pair of fixed guides and 50 are disposed as shownin Fig. 2.

A wire basket is supported within receptacle |0 above rail 41 and above the lower horizontal arms 4| of the sprayer 40. Basket .5| does not extend all the way to the ends of the receptacle, but is spaced therefrom sufllciently to permit the vertical arms 42 to extend between the ends of the basket and theends of the receptacle.

the pump chamber acts upon the vanes 34 of the pump housing and causes this housing to' rotate. Inasmuch as member is secured to the pump housing it describes a circular path designated by the broken line 51 in Fig. 2. This movement of member 35 causes the T 38 and the sprayer to travel along rail 41 in a straight line. When the member 35 has rotated through 90 in a counterclockwise direction from the solid line position shown in Fig. 2, the arm is in a position at right angles to that shown and the roller 46 contacts the fixed guide rail 50.

Continued rotation of' the member 35 causes arms 45 to take the position shown in broken The top of receptacle I0 is closed by means of a hinged cover 52 provided with a pressure relief valve 53. An air duct 54 extends from the motor 23 upwardly outside of receptacle Ill and communicates with a space 55 formed within the cover 52. This space is provided with openings 56 distributed around its edges. The lower end of duct 54 is arranged to receive hot air which has been heated by being blown through the motor for the purpose of cooling the latter. If desired, an electric heating element may be placed within duct 54 in order to further increase the. temperature of the air. Y

The operation of the above described apparatus is as follows:

Dishes to be washed are placed, preferably edgewise, in the basket 5| and cover 52 is closed. Hot water'is admitted through the pipe l5 and the motor 23 is started. -The hot water flows into the annular channel |4, through the opening I1 and channel I8 to the lower part of the pump chamber |9. The water flows through the openings 33 in the impeller and completely fills the pump chamber. Rotation of the impeller 2|! imparts a rotary motion to this water and increases its pressure. The water is discharged into the member 35, from whence it flows through opening 31 into hollow arm 36 and thence through openings 39 into the T 38 and through the arms of the sprayer 40 and out through the small openings 44 therein.

The rotary motion imparted to the water in lines in Fig. 2, thus assuring that the T 38 and sprayer 40 continue movement to the right, as the member 35 rotates in a counter-clockwise direction. If the guide rail 50 were not provided, the T 38 and sprayer 40 might start back to the left. When -the'member 35 reaches a position 180 from that shown in full lines in Fig. 2, the sprayer 40 is at its extreme right hand position 'and further rotation in a counter-clockwise direction of member 35' causes the sprayer to travel to the left along rail 41. Guide rail 49 assures that the sprayer will continue its travel in this direction and reach the full line position.

Movement of the sprayer 4|] back and forth 1 across the receptacle assures that the spray emitted therefrom will strike all parts of the dishes and thus completely remove all dirt therefrom. I

The water discharged from the jets in the sprayer 40 collects in the bottom of receptacle In, and after suflicient water has been introduced in this manner, the supply of water through pipe 15 may be shut off and the water within the receptacle recirculated by opening valve 26. Usually, a detergent is introduced into the receptacle andby recirculating the liquid the streams of water emitted from the sprayer 40 carries this detergent with it, thus eifectively cleaning the dishes.

After the dishes have been cleaned, they may be rinsed by closing the valve 26 and admitting fresh water through the pipe l5.

After the dishes have been rinsed the receptacle may be emptied by opening the valve 26 and the valve in the waste line I6, the valve IS in the inlet line being closed. Under these conditions, the water within the receptacle ||l drains through the .valve port 21 and through a the pump chamber l9 to the passage I6 and through-the opening l1 into the annular channel |4. From here it passes out through the drain l6, which'is preferably connected to the sewage system.

The dishes may be dried by operating the motor 23 after the receptacle has been drained of liquid. There being no liquid present, none is emitted from the sprayer while the hot air discharged from the motor 23 flows through the duct 54 to the space 55 within the cover. From here it is discharged through the openings 56 and comes in contact with the dishes, thus drying them.

In the embodiment of my invention illustrated in Figs. 3 through 5, the receptacle is designated by reference character III, to the bottom of which is secured the casting l2. A pump housing 63 includes a vertically extending shaft part 6| which is rotatably mounted in casting l2. An impeller shaft 62 is rotatably mounted within the shaft part 6| and carries at itsupper'end an impeller wheel 63 located within a pump chamber 03. This chamber is provided with an inlet 35 and an outlet 66. Rotatably secured to the outlet 55 is a hollow arm 61, the arm being secured to the pump housing by means of a bolt 68. Rotatably mounted at the opposite end of arm 61 is a hollow spindle 69 provided with openings in alignment with the hollow interior of arm 61. Spindle 69 supports a ring-shaped sprayer 1! by means of hollow spokes 12. Mounted on the lower solid end of spindle 69 is a gear 13 which is arranged to engage internal teeth on a rack 10. As appears from Fig. 4 this rack is rectangularly shaped with rounded comers. A guide roller I is secured to the upper end of spindle 6.9 and engages the exterior surface of a track 16, which is of the same shape as rack 14. Track 16 may be mounted on the lower part of a wire rack 11 for I supporting the dishes.

Rigidly secured to the top of pump housing 60 is a cylinder I50 within which is reciprocably mounted a piston l5I. The outer end of this piston contacts a projection I52 extending from 7 one side of hollow arm 61. The interior of cylinder. I50 communicates with the pump chamber 64 through a passage I53 formed in a part I54 which is integral with the pump housing. Passage I53 is formed with a shoulder I55, and a ball I56, having a larger diameter than the lower part of the passage below the shoulder, is disposedin the upper part of the passage. A pin I51 is threaded into the lower end of part I54 and serves to prevent.

the ball I56 from seating on the shoulder I55 and completely closing the passage I53. Pin I51 may be adjusted so as to vary the distance the ball is held away from the shoulder. A similar pin I58 is threaded into the upper end of part I54 and prevents the ball I56 from closing the passage leading into cylinder 1%. The arrangement is such that liquid may flow from the pump cham her to the cylinder I50 with less resistance than is ofiered to fiow of liquid in the opposite direction. Pin i51 makes it possible to vary the resistance to flow in said opposite direction.

A conduit I30 is connected to the hot water supply and communicates with the inlet 8| of a multi-position valve 32 (Fig. 5). The outlet 83 of this valve is connected by means of a conduit 04 with avalve chamber 88 in casting I2.

The upper wall of valve chamber 88 is .formed as a valve port communicating with the interior of receptacle I0. This port may be covered by one or more strainers 83. Located within valve chamber 88 is a valve plate 81, which may close either the end of conduit 84 or the port 85. Valve chamber 83 is in direct communication with the inlet 65 of the pump.

A drain conduit is connected to the casting I2 through a valve BI (Fig. 5). The valve is. arranged to be operated by means of a diaphragm 32. A coil spring 93 tends to hold the valve in open position. Diaphragm chamber 94 is connected by means *of a conduit with a port 96 formed in valve 82.

- Thisvalve includes a rotatable valve member 31 formed with a passage 98 extending straight through it and abranch passage 99 extending at right angles to and communicating with passage S8. A handle I00 is secured to stem IIII of with a pin I I0 which is forced against the periph-.

Also rigidly secured to stem IOI is A mercury switch H8 is pivotally mounted adjacent to disc I02 and is provided with a projection I I5 located in the path of travel of the bellcrank lever I09. This switch is in the circuit of the electric motor 23 and, when in the tilted position shown in-Fig. 12, opens the circuit and when turned to a horizontal position, the circuit is closed.

Secured to the lower part of receptacle I0 is 'a cylinder I20. Reciprocably mounted within the cylinder is a plunger I 2I. The diameter of the plunger is such with respect to the cylinder as to leave an appreciable clearance I22 therebetween. A packing I23 at the top of the cylinder prevents leakage between the cylinder and the plunger at this point. A valve housing I 24 (Fig. 5) is associated with cylinder I20 and is formed with an inlet hhamber I25 and an outlet chamber 126. Chamber I25 is connected to the water supply line 80 by means of a conduit I21 (Fig. 4) while chamber I26 is connected to an overflow drain I28 by means of a conduit I29. The upper end of overflow I28 communicates with the interior of receptacle I0 just below the level of the sprayer II. Valve housing I24 is formed with a passage I30 which communicates with the space I22 between the cylinder I20 and the plunger I2I. Communication between passage I30 and chambers I26 and I25, respectively, is controlled by '7 I26 to passage I30, while establishing communication between chamber I25 and passage I30.

The upper end of rod I32 is slidably supported by means of a bracket I33. A spring I34 tends to hold the rod in its uppermost position, that is in the position illustrated in Fig. 5. A pin I35 is carried by rod I32 and extends'through the top of the casing I I adjacent to a hinge I36 by means of which the cover 52 is hinged to the casing. This hinge is provided with a. projection I3Ba which strikes the upper end of pin I35 when the cover is opened, thus depressing the pin and the rod I32.

The upper end of plunger I2I is secured to a frame I31 extending around the interior of receptacle I0. Frame I31 is provided with a plurality of rollers I38 which roll against the interior of the receptacle I0. The dish rack 11 is secured to frame I31.

As shown in Figs. 5, 14, and 15, the interior of the receptacle I0 and the inside of the cover 52 are preferably formed with depressions. The depressions I40 in the sides of the receptacle are preferably formed with spherical upper parts I4I I which merge into conical lower parts I42. The recesses I43 in the cover are preferably spherical throughout. V

This embodiment operates as follows:

When it is desired to wash dishes, the cover 52 is opened. Projection I36d on hinge I 36 strikes n '35 and moves it and rod I32 downwardly against the force of spring I34. This movement of the rod causes the valve I3I to interrupt communication between discharge chamber I26 and passage I30, and to establishcommunication benlet chamber I25 and this passage. Contween sequently, water under'the pressure existing in raises it. Upward movement of the piston causes frame I3I to move upwardly, the rollers I38 rolling against the inner walls of receptacle I0. Thus, the wire rack 11 is raised to an elevation at which the dishes may be easily placed thereon,

preferably in edgewise position.

'Cover 52 is now closed and spring I34 moves the rod I32 to the position shown in Fig. 5, thereby establishing communication between passage I30 and discharge chamber I26. The weight of the frame I3! and the dishes forces piston I2I downwardly, the water being discharged through passage I30 into chamber I25, from where it flows through pipe I29 to the overflow conduit I28.

The valve member 91 of valve 82 is assumed to have been in the ofl position shown in Fig. 6. In this position the disc I02 is in the position shown in Fig. 12, that is, with the pin M on the bellcrank lever I09 engaging the deep notch I04. With the bell-crank lever in this position, thelatch H2 does not engage the side of the recess H3 in the cover and thus the cover is unlocked. If the valve handle I00 is nowturned a quarter .turn in clockwise direction, the valve member is brought to the position shown in Fig. 7. In this position passage 98 in the valve member establishes communication between ports 8| and 83 and consequently water is supplied from conduit 80 to the valve and from the valve through conduit 84 to the chamber 80 in the casting I2 (Fig. 3). The

- water lifts the valve disc 81, thus closing the port 85. The water flows from the. chamber 08 through the inlet into the pump chamber 84.

Turning of the valve handle I00 also turns disc I02 a quarter turn in clockwise direction. This causes the pin IIO on the bell-crank lever I09 to be moved out of the deep notch I04, thus pivoting the bell-crank lever in a counter clockwise direction.- This movement of the bell-crank lever causes the latch II2 to engage the cover, thus locking it closed. The bell-crank lever I09 also strikes the projection III on mercury switch I I4, and tilts the switch to closed position. Pin IIO engages the shallow notch I01 in the disc I02, but

the depth of this notch is just suflicient to maintain the parts in the desired position without either unlocking the cover or opening the switcr Closing of the switch II4 causes electric moto 23 to drive impeller 83. This imparts rotary motion. to the water in the pump housing, which causes the housing itself to rotate, as described in connection with Figs. land 2. At the same time, water under pressure is discharged through the outlet 80 of the pump to the hollow arm 81, from whence it passes through openings I0, hollow spindle 69, hollow spokes 12, to the sprayer ring II. form of upwardly directed jets.

From this ring the water is emitted in the to the rack. Force appliedin this direction obviously cannot cause movement of the gear along the rack and in order to prevent the apparatus stalling at these points cylinder I50 and piston I5I are provided. Water under the pressure imparted by the pump flows into cylinder I50 through passage I53 and exerts a force against the inner end of piston I5I. Thus, the piston is continuously exerting a force against projection I52 on arm 61, which force is at an-angle to that imparted to the arm by the rotation of the pump housing. Consequently, when the gear reaches a point on rack I4 where it would stall as aforesaid,

Rotation of the pump housing 60 causes the the force exerted by piston I5I causes the gear to continue past this deadpoint.

The piston andcylinder also act as a dash pot to absorb shock when the gear travels around the corners of the track. When this takes place projection I52 forces piston I5I into the cylinder I50. Howevendue to the resistance to flow of liquid out of the cylinder, which is offered by the ball I56 in conjunction with the shoulder I55, the

movement of the piston into the cylinder is retarded.

With the valve 91 in the position shown in Fig. 7 passage 99 establishes communication between passage 98 and valve port 96. Consequently, water under pressure is admitted through conduit 95 into diaphragm chamber 94, thus maintaining valve 9| in the closed position shown in Fig. 5. With the valve in this position, drainage of water from the receptacle I 0 into the waste conduit is prevented.

After the apparatus has operated in the above described manner longenough so that the operator believes sufllcient water has been admitted into the receptacle. I0, the valve I00 is turned 45 in a clockwise direction to the position shown in Fig. 8. With the valve in. this position flow of liquidtherethrough is prevented. At the same time, pin IIO on bellcrank lever I29 has entered the deep notch I03 in the disc I02, thus unlock- I ing the cover and opening the switch H4. The cover may then be opened to determine whether or not suihcient liquid has been admitted. If more liquid is required, the cover is closed and the valve returned to the position shown in Fig. 'I. On the other hand, if there is enough water in the receptacle, the valve is turned to the position shown in Fig. 9. In thispositlon flow of water through the .valve from port III to port 83 is cut oil? and consequently no water is supplied through pipe 84 to the pump. However water pressure is maintained through passages 99 and 98 in thevalve member to conduit and there-' fore drain valve 9I is held closed. With the valve in this position, pin I III on the bell-crank lever engages the shallow notch I06 in the disc :Illi, thus locking the cover and closing the switch Inasmuch as no water is admitted through conduit 84, valve disc 81 drops to its lower position and water in the receptacle I0 flows through valve port 85 to the inlet 55 of the pump. Operation of the pump thus causes the recirculation of water from the receptacle through the sprayer.

After the apparatus has been operated in this manner for a sufficient length of time to thoroughly wash the dishes, valve 91 is turned to the 2,851,842 .disc 81, thus closing port 85 and preventing the 10, nevertheless, the-water trapped in the diaphragm chamber will serve to maintain the valve closed. However, if the level of the water in the receptacle is raised sufficiently during the rinsing operation, it will overflow through the overflow conduit I28.

After the dishes have been rinsed the valve 91 may be turned to the position shown in Fig.

11, in which position flow of water through the valve is shut oil. In this position of the valve, pin H engages the deep notch H in the disc 802 and thus the cover is unlocked and the switch H8 is open. The operator then opens the cover and, if the dishes have been thoroughly washed and rinsed, leaves the cover open. This causes the frame I31 to be raised, in the manner previously described and the dishes may be removed.

The receptacle may be drained by turning the valve!" another one-eighth turn from the position shown in Fig. 11, which brings the valve back to the position shown in Fig. 6. In this position port 96 is connected to port 83 and thus the water pressure in the diaphragm chamber 94 is relieved whereupon the spring 93 opens the valve 9!. Under these conditions the water drains from the receptacle through the port 85' into the chamber 88, and valve 9| to drain conduit 90.

During the washing and,rinsing operations thence through the any of the jets from the sprayer ll which miss the dishes, impinge upon either the sides or the top of the receptacle. The depressions H0 in the sides are so shaped that the streams of water striking them are redirected back against the dishes. Likewise, the streams striking the depressions M3 in the cover are redirected against the dishes. The combination of conical and spherical surfaces of the depression I cause the streams to be turned through an angle of approximately 90, while the spherical depressions I 43 cause the streams to beturned through practically 180.

In the modification illustrated in Fig. 16 the guide roller 15 as shown in Fig. 3, is replaced by a roller 1511 located below the gear 13. This roller engages a track 16a mounted on casting l2. However, the operation of this modification is the same as that previously described and hence need not be repeated.

, It will thus be seen that I have provided an improved dishwasher which may be controlled through the manipulation of a single valve so as to flll,.wash, rinse and drain, while at the same time starting and stopping themotor. Furthermore, it is impossible to open the cover while the apparatus is in operation.- Moreover, opening of the cover automatically lifts the rack containing the dishes so as to make it more accessible for putting in or taking out the dishes, and closing the cover lowers the rack to operating position.

In the embodiment of the invention shown in Figs. 17-20 the washing member, which is here designated by 20l,- is rotatably journaled by means of a shaft 202 on an arm- 203 projecting from the pump casing 60.. Both the pump casing and thearm 203, in this embodiment, are 7 teeth of an intermediate gear wheel 208 journailed in part 205. The latter gear wheel engages,-in turn, with a stationary gear or track 209 rigidly connected by bolts 2|0 to the bottom i 2 of the container l0 and provided with external teeth. The above-mentioned gear wheels 201, 208 and 209 are arranged beneath the part 205 of the casing. The gear wheels-201 and 208 are protected from below by a washer 2! I which is rigidly connected to part 205 and which. together with said part, forms a space 2| 2 in which said wheels rotate. For this purpose the half 205 of the casing is formed with a downwardly directed crown-shaped wall 2I3 enclosing the whole of, the gearing 201-209. If desired, the washer 2 may extend beneath the whole gear which, in such case, is encased.

The pump casing 60 is formed with an annular channel 2. Between the outlet opening 2l5 of this channel in the sprayer member 2M and a flange 2H5 (see Fig. 19) connected with this member there is arranged a packing ring 2|! made of rubber or other suitable packing material. This packing ring 2, which istightened in the flange 2l6 and bears against the opening '2i5, has two functions, namely to prevent washing and rinsing liquid from leaking from said opening into the container l0, and to prevent grains of sand or other particles from penetrating between the said opening and flange. A similar packing washer 2|8 with the same function is arranged between the pump casing 60' being provided with a handle 22l so that it can be easily raised.

The bearing sleeve 206 of the sprayer member 7 20! projects, as shown in Fig. 17, through the outlet channel or opening 2l5of the pump casing 204 in such a manner that an annular space 222 for the passage of the liquid from the pump casing to the sprayer member is formed round the sleeve 206. The sprayer member 20| consists of an elongated or oval ring 224 provided with spray jet openings 223 (Fig. 18) and made of tubular material, as well as a likewise tubular bridge 225 which connects two parts by extending across the short diameter of the ring. With the middle part of this bridge, which part, as mentioned, forms, like the oval ring 224, channels for the working liquid of the machine, that is washing or rinsing liquid, the upper end of the I pin or shaft 202 'is connected.

The embodiment according to Figs. 17 through 20 is similar, as regards the'extension of the machine, the circulating device and the rotatable pump casing, in the main with the embodiment described in connection 4,- that is the dish container I0 has an unrounded, suitably square shape d the dishes are carried-by a strainer be torn I'L' A detail in which the two said embodiments difler fromeach other, is the clutch between the shaft 62 of the conveyer or pump impeller and the belt pulley 22. In forms of the invention shown in Figs. 1 and 3 this clutch consists of an ordinary jawclutch between the shaft 62 and a lower shaft with Figs, 3 and I dosing with the sprayer device connected therewith out of the container I for cleaning purposes. The lower end of the shaft sleeve 221 is closed by an easily removable bottom nut 228, it thus being possible, if necessary, to drain off water from this sleeve.

The dish washing machine shown in Figs. 17-20 works as follows. The inlet 84 of the apratus is opened, the valve disc 81 being raised by the entering water and pressed against its upper seat 229 beneath the strainer. This ,causes water to flow into chamber 230 beneath the con tainer bottom [2, thence through the openings 65 to the pump casing 60 and from the latter to the sprayer member 20!, through the spray jet openings 223 into the container l0 which is filled to a level with an overflow pipe 23l which is arranged in the container and the upper edge of which is approximately on a line with the lower edge of the sprayer member 20!. When this level has been reached, the inlet 84 is closed, the value disc 81 returning to its lower position to form a tight joint with a lower'seat 232. In this case, the liquid passes freely from the container l0 by way of chamber 230 to the pump casing 60.

The motor 23 is started, the pump impeller 63 setting in rotation the mass of liquid in thepump casing, and also imparting a rotary motion to the pump casing itself, as previously described. The pump impeller or .conveyer 63 at the same time forces the washing liquid through the sprayer member 201 and the openings 223 against the dishes. The rotation of the pump casing 60 will cause the bearing sleeve 206 rigidly connected with it and rotatably receiving the shaft 202 of the sprayer member 20l to be turned round in a circular path, the radius of which is determined by the distance between the shaft 62 and the 'turin'g axis 202 of the sprayer member 20l. The washing member 20l itself will, during the said turning motion, rotate around its own axis, but owing to the arrangement of the gearing 201-209, in a direction opposite the direction of rotation of the pump casing .60. This means that the sprayer member will eflect a planetary motion. During this motion both corners 293 of the sprayer member 20! will be introduced into the corners of the container l0. The sprayer member, as it were, unrolls itself during its motion along the limiting walls of the container, so that all dishes, no matter where they are placed in the container, will be subjected to an efficient spraying. The said motion of the sprayer member is attained by a ratio of 2 to 1 of the gearing 20'|209, so that the ends of the member are alternately introduced into the adjacent corners of the casing. The initial position of sprayer member should, for attaining this synchronization, be so adjusted on mounting that of the machine, should have at least four corners, and the sprayer member should be provided with at least one point or one corner. The jet openings of the sprayer member should, in the main, have the same direction as the axis of rotation of the member itself. If desired, the dish container or casing may, in place of the fixed wheel or track'209, be provided with a fixed rim equipped with internal teeth against which rim the gear wheel 201 of the washing member rolls. In this case the intermediate wheel 208 will be unnecessa y, as the last-mentioned device will cause the washing member to rotate 'in a direction opposite to that of the pump casing. Further, the sprayer member may, as mentioned, be provided with only one point or one comer, and if the ratio of gearing between the toothed gear or track rigidly connected to the container and the gear wheel rigidly connected to the washing member is 4 to 1, this single point of the sprayer member will, during the motion of the member in' the container, successively penetrate into all four comers of the container. It obviously is not necessary that the parts 201, 208 and 209 should consist of toothed members, as these or corresponding members may also consist of friction members or the like.

Evidently, dish washing machines of the kind shown in the accompanying drawings and described above may also work without pressure water from a conduit, in that the necessary water for both washing and rinsing purposes may be poured into the dish container through its upr per opening. In this case the circulation of working liquid in the container is effected exclusively by the conveyor or the pump impeller.

Obviously the details of structure of the dish washing machines described above and shown in the drawings may be changed accordin to the mechanics skill, and varioustypes of machine be used without departing from the spirit of invention. Thus, the sprayer member may be arranged directly on the rotatable pump casing, thus takingpart in its rotation.

What is claimed:

1. In a dish washing apparatus, a casing, a water pump housing, means for rotatably mounting the housing in the casing, an impeller, means for rotatably mounting said impeller in said housing, means for supplying water to said its longitudinal axis extends through one of the corners of the casing and the centre of the pump casing. As soon as the ,washing operation is completed, rinsing is effected in the manner de-' housing, means for driving said impeller, means on the inside of said .housing to induce rotary motion thereof by impingement of water thereon, a sprayer member, means to mount said sprayer member for movement along a linear path, means to supply water to said member from said pump, and'means connected between said housing and said member for transforming the rotational movement of the housing into linear movement of said member. I

2, In a dish washing apparatus, a casing, a water pump housing,means for rotatably mounting the housing in the casing, an impeller, means for rotatablymounting said impeller in said housing, means for supplying water to said housing, means for driving said impeller, means on the inside of said housing to induce rotary mov tion, thereof by impingement of water thereon,

scribed in connection with the'preceding embodiments.

In the last-mentioned embodiment the radiaa sprayer member, means-to mount said sprayer member for movement along a linear path, means to supply water to said member from said pump,

means connected between said housing and said tion surface, that is the surface exposed to the jets of the sprayer member during the operation member for transforming the rotational movement of. the housing into linear, movement of for rotatably mounting said impeller in said housing, means for supplying water to said housing, means for driving said impeller, means on the inside of said housing to induce rotary motion thereof by impingement of water thereon, a hollow arm extending radially from said housing, a sprayer member, means for rotatably mounting said member adjacent to the outer end of said arm, said arm constituting means for supplying water from said pump to said member and for moving said member along a linear path, a track, means for securing said track to said frame, a wheel, and means for securing said wheel to said member concentric to the axis of rotation of said member on said arm, said wheel engaging said track to cause rotation of said, member around said axis as the member travels along said linear path. 7

4; In a dishwashing apparatus, ,a casing, a housing for a water pump, means to rotatably mount the housing in the casing, an impeller, means to rotatably mount the impeller in the housing, means for supplying water to said housing, means for driving said impeller, means on the inside of the housing to induce rotary motion thereof by impingement of water thereon, a sprayer member, means to mount the sprayer member for movement in a straight line, means to supply water to said member from said pump,

and means connected between said housing and said member for transforming rotational movement of said housing into straight line movement of said member.

5. In a dishwashing apparatus, a casing, a water pump housing, means for rotatably mounting said housing in said casing, an impeller,

inside of said housing to induce rotary motion thereof by impingement of water thereon,'a stationary straight track having its center in line with the center of rotation of said housing, a sprayer member, means for mounting said member to run along said track, and a hollow connecting rod pivotally connected to said member and to said housing, said rod being pivoted to said housing at a point spaced from the center of rotation thereof a distance equal to the length of the connecting rod, whereby rotation of said housing causes said member to run back and forth along said track with a travel in each direction thereof equal to four times the length of said rod, said hollow rod serving to convey water from said housing to said member.

8. In a dishwashing apparatus, a casing, a water pump housing, means for rotatably mounting said housing in said casing, an impeller. means for rotatably mounting saidimpeller' in said housing, means for supplying water to said housing, a motor for rotating said impeller, means on the inside of said housing to induce rotary motion thereof by impingement of water thereon, a stationary endless track, a sprayer member, means for mounting said member to travel along said track, means for supplyin water from said pump to said member, and means driven by said rotating housing for moving said member along said track.

9. In a dishwashing apparatus, a casing, a water pump housing, means for rotatably'mounting said housing in said casing, an impeller, means for rotatably mounting said impeller in said housing, means for supplying water to said housing, a motor for rotating said impeller, means on the inside of said housing to induce rotary motion thereof by impingement of water thereon,

means for rotatably mounting said impeller in said housing, means for supplying water to said housing, a motor for rotating said impeller, means on the inside of said housing to induce rotary motion thereof by impingement of water thereon, a stationary track, a sprayer member, means for mounting said member to move along said track, means for supplying water from said pump to said member, and means driven by said rotating housing for moving said member along said track.

6. In a dishwashing apparatus, a casing, a water pump housing, means for rotatably mounting said housing in said casing, an impeller, means for rotatably mounting said impeller in said housing, means for supplying water to said housing, a motor for rotating said impeller, means on the inside of said housing to induce rotary motion thereof by impingement of water thereon, a stationary track, a sprayer member, means for mounting said member to run along said track, and a hollow connecting rod pivotally connectedto said member and to said housing adjacent to its periphery for conveying water from said housing to said member and for causing said member to move along said track when said housing rotates. 7. In a dishwashing apparatus, a casing, a. water pump housing, means 'for rotatably mount'-. ing said housing in said casing, an impeller, means for, rotatably molmting said impeller in said housing, means for supplying water to said housing,

a motor for rotating said impeller, means on the r by the motion of said member of circular'and straight line a stationary track, a sprayer member, means for mounting said member to travel along said track, a wheel, means for securing said wheel to said member in a position to engage said track to thereby rotate said member, a conduit member pivotally connected to said pump housing and to said member for supplying water from said pump to said member, and means driven by said rotating housing for moving said, member along said track.

10. In a dishwashing apparatus, a casing, a

water pump housing, means for rotatably mounting said housing in said casing, an impeller,

means for rotatably mounting said impeller in said housing, means for Supp ying water to said housing, a motor for rotating said impeller, means on the inside of said housing to induce rotary motion thereof by impingement of water thereon, a stationary endless substantially rectangular track, a sprayer member, means for mounting said member to travel aroundsaid track, a conduit member pivotally connected to said pump housing and to said member for-supplying water from said pump to said member, means driven by said rotating housing for moving said member along said track, a wheel, means for securing said wheel to said member in aposition to engage said. track for rotating said member, whereis a combination motions. 11. In a dishwashing apparatus, a casing, a water pump housing, means for rotatably mounting said housing in said casing, an impeller, means for rotatably mounting said impeller in said housing, means for supplying water to said 7 1 housing, a motor for rotating said impeller, means on the inside of said housing to induce rotary water pump housing, means for rotatably mounting said housing in said casing, an impeller, means for rotatably mounting said impeller in said housing, means to admit water to said hous-' ing, means to rotate said impeller, means on the inside of said housing to induce rotary motion thereof by impingement of water thereon, a stationary rectangular track, a sprayer member, means for mounting said member to travel around said track, a hollow arm pivotally connected to said housing and to said member for conveying water\from the pump to said member and for moving said member around said track in response to rotation of said housing, and means for resisting sudden pivotal movement of said arm with respect'to said housing as said member travels around a corner of said rectangular track and for'continuously imposing a force acting to cause pivoting in the opposite direction.

13. In a dishwashing apparatus, a casing, a

water pump housing, means for rotatably mounting said housing in said casing, an impeller, means for rotatably mounting said impeller in said housing, means to admit water to said housing, means to rotate said impeller, means on the inside of said housing to induce rotary motion thereof by impingement of water thereon, a stationary rectangular track, a sprayer member, means for mounting said member to travel around said track, a hollow arm pivotally connected to said housing and to said member for conveying water from.the'pump to said member and for moving said 'member around said .track in response to rotation of said housing, a dash pot device including a piston in a cylinder disposed between said housing and said arm for resisting sudden pivotal movement of said arm with respect to said housing as said member travels around a corner of said track, and means for admitting water under pressure from said housing to said cylinder whereby said piston continuously imposes a force acting to cause pivoting in the opposite direction.

FREDRIK JOHAN ROBERT KARLSTRC'iM. 

